摘要： On a 2 dimensional grid with R rows and C columns, we start at (r0, c0) facing east. Here, the north west corner of the grid is at the first row and c 阅读全文

摘要： Given a set of N people (numbered 1, 2, ..., N), we would like to split everyone into two groups of any size. Each person may dislike some other peopl 阅读全文

摘要： 题目要求不修改链表结构，同时不用额外的内存，去找到链表中环的起点。 我们可以通过快慢指针很容易判断有没有环，接下来，再把快指针的步伐也变为1并从head开始走，那么快慢指针再次相遇对应的指针就是环的起点。 解释：可以把问题抽象成一个直线和圈的结构， 粉色点表示相遇点，那么快指针走过a+b+c+b,慢 阅读全文

摘要： Given an integer array nums, find the contiguous subarray within an array (containing at least one number) which has the largest product. 题意：求最大的连乘。 思 阅读全文

摘要： At a lemonade stand, each lemonade costs $5. Customers are standing in a queue to buy from you, and order one at a time (in the order specified by bil 阅读全文

摘要： We are given a binary tree (with root node root), a target node, and an integer value . Return a list of the values of all nodes that have a distance 阅读全文

摘要： Given a balanced parentheses string S, compute the score of the string based on the following rule: Example 1: Input: "()" Output: 1 Example 2: Input: 阅读全文

摘要： Given two strings A and B of lowercase letters, return true if and only if we can swap two letters in A so that the result equals B. 题目大意：给出A,B两个字符串，问 阅读全文

摘要： Initially on a notepad only one character 'A' is present. You can perform two operations on this notepad for each step: Copy All: You can copy all the 阅读全文

摘要： Given an array of non negative integers, you are initially positioned at the first index of the array. Each element in the array represents your maxim 阅读全文